Transport stream recording and transmission method and device thereof

Abstract

A partial transport stream (TS) is temporarily recorded in a recording medium before being transmitted to a network. Here, when the partial TS is generated, null packets (invalid packets) are inserted into some of positions of packets determined not to be recorded, at a predetermined rate, and the resultant partial TS is recorded into the recording medium. When transmission is performed, the null packets previously inserted during recording are each replaced with a packet which contains information which is required during transmission, e.g., a program-specific information/service information (PSI/SI) packet. As a result, the load of packet inserting process during transmission can be reduced.

1 . A method for temporarily recording a transport stream (TS) in a recording medium and transmitting the recorded TS to a network, the method comprising:
 a first step of selecting a TS packet relating to a predetermined service to be recorded based on a packet identifier (PID) contained in the input TS, and removing a TS packet not to be recorded;   a second step of inserting an invalid packet into a position of the TS packet not to be recorded at a predetermined rate to generate a record partial TS;   a third step of outputting and recording the record partial TS into the recording medium;   a fourth step of reading the record partial TS from the recording medium and detecting the invalid packet inserted in the second step;   a fifth step of replacing the detected invalid packet with a packet containing information required during transmission to the network to generate a transmit TS; and   a sixth step of transmitting the transmit TS to the network.   
     
     
         2 . The method of  claim 1 , wherein
 the second step includes a step of generating and inserting a program-specific information/service information (PSI/SI) packet relating to the predetermined service to be recorded.   
     
     
         3 . The method of  claim 1 , wherein
 the second step includes a step of determining information about a position of the inserted invalid packet,   the third step includes a step of recording the invalid packet position information into the recording medium, together with the record partial TS, and   the fourth step includes a step of, when reading out the record partial TS, reading the invalid packet position information from the recording medium, and detecting the position of the inserted invalid packet from the invalid packet position information.   
     
     
         4 . A transport stream recording and transmission device comprising:
 a PID filter configured to select a transport stream (TS) packet relating to a predetermined service to be recorded based on a packet identifier (PID) in an input TS;   a packet replacer configured to replace a TS packet which the PID filter has determined is not to be recorded with a packet containing information required during recording which is an invalid packet or a program-specific information/service information (PSI/SI) packet;   a recording medium configured to record the partial TS output from the packet replacer; and   a network interface configured to read the partial TS recorded in the recording medium and transmit the partial TS to a network.   
     
     
         5 . The transport stream recording and transmission device of  claim 4 , wherein
 the packet replacer determines an insertion interval of the invalid packet or the PSI/SI packet so that the invalid packet or the PSI/SI packet is inserted at a predetermined rate.   
     
     
         6 . The transport stream recording and transmission device of  claim 4 , wherein
 the packet replacer inserts the invalid packet into a boundary of a logic data block of the PSI/SI packet.   
     
     
         7 . The transport stream recording and transmission device of  claim 4 , wherein
 the packet replacer, when inserting the invalid packet or the PSI/SI packet, outputs information about a position of the inserted packet.